Touch display panel and touch display device

ABSTRACT

In general, embodiments of the present invention provide systems and methods for a touch display panel and a touch display device including a touch display panel. The touch display panel includes: a substrate, and a common electrode layer located on the substrate. The common electrode layer includes multiple touch electrodes insulated from each other. Each of the touch electrodes is electrically connected to a driving circuit via one touch lead. The touch electrodes and the touch leads are located in the same layer. A part of the touch electrodes are divided into multiple sub-electrodes by touch leads adjacent to the divided touch electrodes. The sub-electrodes of each of the touch electrodes are electrically connected to each other via at least one bridge which is located in a different layer from the touch electrode, to reduce parasitic capacitances between the touch leads and the touch electrodes and alleviate an influence from the parasitic capacitances on touch performance.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims the priority to Chinese PatentApplication No. 201510153183.5, entitled “TOUCH DISPLAY PANEL AND TOUCHDISPLAY DEVICE”, filed on Apr. 1, 2015 with the State IntellectualProperty Office of the PRC, which is incorporated herein by reference inits entirety.

FIELD OF THE INVENTION

The disclosure relates to the field of touch technology, and, inparticular, to a touch display panel and a touch display device.

BACKGROUND OF THE INVENTION

According to the conventional embedded touch display technology, acommon electrode layer of a display panel generally doubles as touchelectrodes. The common electrode layer is generally divided intomultiple touch electrodes, and each of the touch electrodes iselectrically connected to a driving circuit IC via a touch lead locatedin a different layer from the common electrode layer.

The above arrangement may result in partial overlappings between thetouch leads and the touch electrodes and parasitic capacitances.Therefore, interferences among the touch electrodes may be caused, andtouch performance of an embedded self-capacitive touch screen may beaffected.

BRIEF SUMMARY OF THE INVENTION

In view of the above, a touch display panel and a touch display deviceare provided according to the present disclosure, to solve the problemin the conventional art that touch performance of an embeddedself-capacitive touch screen is affected due to parasitic capacitancesbetween touch leads and other touch electrodes.

The following technical solutions are provided in the presentdisclosure.

A touch display panel is provided, which includes: a substrate, and acommon electrode layer located on the substrate. The common electrodelayer includes multiple touch electrodes insulated from each other; eachof the multiple touch electrodes is electrically connected to a drivingcircuit via one touch lead. The touch electrodes and the touch leads arelocated in the same layer. A part of the touch electrodes are dividedinto multiple sub-electrodes by touch leads adjacent to the dividedtouch electrodes. The sub-electrodes of each of the touch electrodes areelectrically connected to each other via at least one bridge which islocated in a different layer from the touch electrode.

A touch display device is provided, which includes the touch displaypanel described above.

In the touch display panel and the touch display device provided by thepresent disclosure, the common electrode layer includes multiple touchelectrodes insulated from each other; each of the touch electrodes iselectrically connected to a driving circuit via one touch lead; thetouch electrodes and the touch leads are located in the same layer; apart of the touch electrodes are divided into multiple sub-electrodes bytouch leads adjacent to the divided touch electrodes; and thesub-electrodes of each of the touch electrodes are electricallyconnected to each other via at least one bridge which is located in adifferent layer from the touch electrode. Hence, parasitic capacitancesbetween the touch leads and the touch electrodes are reduced and aninfluence from the parasitic capacitances on touch performance isalleviated.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to illustrate technical solutions in embodiments of the presentdisclosure or the conventional art more clearly, drawings to be used inthe description of the embodiments or the conventional art are describedbriefly hereinafter. Apparently, the drawings in the followingdescription are only for some embodiments of the present application.For those skilled in the art, other drawings may also be obtained basedon the provided drawings without any creative work.

FIG. 1 is a schematic structural diagram of a touch display panelaccording to an embodiment of the disclosure;

FIG. 2 is a schematic sectional view of a touch electrode, a touch leadand a bridge according to an embodiment of the disclosure;

FIG. 3 is a schematic sectional structural diagram of a touch displaypanel according to an embodiment of the disclosure;

FIG. 4 is a schematic top view of a touch display panel according to anembodiment of the disclosure;

FIG. 5 is a schematic sectional structural diagram of an touch displaypanel according to an embodiment of the disclosure;

FIG. 6 is a schematic sectional view of a touch electrode, a touch leadand a common electrode wire according to an embodiment of thedisclosure; and

FIG. 7 is a schematic sectional view of a touch electrode, a touch leadand a common electrode wire according to an embodiment of thedisclosure.

DETAILED DESCRIPTION OF THE INVENTION

Technical solutions according to embodiments of the present disclosureare hereinafter described clearly and completely in conjunction with thedrawings of the embodiments of the present disclosure. Apparently, thedescribed embodiments are only some of the embodiments of the presentapplication but not all the embodiments. Any other embodiments obtainedby those skilled in the art based on the embodiments of the presentdisclosure without any creative work fall within the scope of protectionof the present disclosure.

As shown in FIG. 1, a touch display panel 2 is provided according to afirst embodiment of the disclosure. The touch display panel 2 includes:a substrate (not shown in FIG. 1), a common electrode layer locatedabove the substrate and an insulating layer located between thesubstrate and the common electrode layer. The common electrode layerincludes multiple touch electrodes 20 insulated from each other. Each ofthe touch electrodes 20 is electrically connected to a driving circuitIC 22 via one touch lead 201. The touch electrodes 20 and the touchleads 201 are located in the same layer. For a part of the multipletouch electrodes 20, each touch electrode 20 is divided into multiplesub-electrodes 202, and one touch lead 201 is located between any twoadjacent sub-electrodes of the touch electrode. The sub-electrodes 202in each of the touch electrodes 20 are electrically connected to eachother via at least one bridge 203 located in a different layer from thetouch electrode 20. The insulating layer includes multiple via holes,and each bridge 203 is electrically connected to correspondingsub-electrodes through the via holes. Moreover, the number of thebridges 203 between adjacent sub-electrodes 202 in each of the touchelectrodes 20 is not limited. In the embodiment, two bridges 203 areprovided between adjacent sub-electrodes 202 in each of the touchelectrodes 20.

Reference is further made to FIG. 2, which is a sectional diagramshowing a position relationship among the touch electrode 20, the touchlead 201 and the bridge 203. The touch lead 201 is located between twoadjacent sub-electrodes 202 of one touch electrode 20, and the touchlead 201 is insulated from the sub-electrodes 202. The bridge 203 andthe touch electrode 20 are located in different layers, and the bridge203 is electrically connected to corresponding sub-electrodes 202through via holes 204. A parasitic capacitance between the touch lead201 and the touch electrode 20 may be reduced, since an overlapping areabetween the touch lead 201 and the touch electrode 20 is reduced.

Further, for each touch electrode 20 provided with the bridges 203, abridge may be further provided at a position where no bridge 203 islocated, that is, a bridge is further provided below a region of thetouch electrode other than an opening of the touch electrode 20, toimprove display uniformity with the arrangement of the further providedbridge. The further provided bridge may be located in the same layerwith the bridges 203, or may be located in a different layer from thebridges 203, which is not limited in the present disclosure. Moreover,the number of the further provided bridge within one touch electrode 20is not limited. In addition, the further provided bridge may beelectrically connected to a corresponding sub-electrode 202 through avia hole.

As shown in FIGS. 3 and 4, the touch display panel 2 in the embodimentfurther includes multiple thin film transistors 40. The thin filmtransistor 40 includes: a gate 401, a semiconductor layer 402 locatedabove the gate 401, and a source 403 and a drain 404 located on asurface of the semiconductor layer 402. The gate 401 of the thin filmtransistor 40 is electrically connected to a gate line 410 to receive ascan signal; the source 403 is electrically connected to a data line 411to receive a data signal; and the drain 404 is electrically connected toa pixel electrode 50. After the thin film transistor 40 is turned onunder control of the scan signal, the data signal is transmitted to thepixel electrode 50 via the source 403 and the drain 404, to provide adisplay voltage for a pixel unit.

In the embodiment, the common electrode layer 20 is located abovesurfaces of the pixel electrode 50 and the thin film transistor 40, thatis, the pixel electrode 50 is located between a substrate 60 and thecommon electrode layer 20. In this case, the bridge 203 may be locatedin the same layer with the gate 401 of the thin film transistor 40, ormay be located in the same layer with the data line 411, or may belocated in a single layer. In the embodiment, preferably, the bridge 203and the gate 401 are located in the same layer to increase a distancebetween the touch lead 201 and the bridge 203, thereby reducing aparasitic capacitance between the touch lead 201 and the touchelectrode, i.e., the common electrode layer 20. Practically, the presentdisclosure is not limited thereto, and in other embodiments, the bridge203 may be located in a different layer from the gate 401. For example,the bridge 203 may be located in the same layer with the source 403 orthe drain 404 of the thin film transistor 40.

In the touch display panel according to the embodiment, the commonelectrode layer includes multiple touch electrodes insulated from eachother, and each of the touch electrodes is electrically connected to adriving circuit via one touch lead; the touch electrodes and the touchleads are located in the same layer; for a part of the touch electrodes,each touch electrode is divided into multiple sub-electrodes, where onetouch lead is located between any two adjacent sub-electrodes of thetouch electrode; and the sub-electrodes in each of the touch electrodesare electrically connected to each other via at least one bridge locatedin a different layer from the touch electrode. Hence, parasiticcapacitances between the touch leads and the touch electrodes arereduced and an influence from the parasitic capacitances on touchperformance is alleviated.

A touch display panel is provided according to a second embodiment ofthe present disclosure. Similarly, the touch display panel includes: asubstrate (not shown in FIG. 4), a common electrode layer located abovethe substrate, and an insulating layer located between the substrate andthe common electrode layer. The common electrode layer includes multipletouch electrodes 20 insulated from each other. Each of the touchelectrodes 20 is electrically connected to a driving circuit IC22 viaone touch lead 201. The touch electrodes 20 and the touch leads 201 arelocated in the same layer. For a part of the touch electrodes 20, eachtouch electrode is divided into multiple sub-electrodes 202, where onetouch lead 201 is located between any two adjacent sub-electrodes of thetouch electrode 20. The sub-electrodes 202 in each of the touchelectrodes 20 are electrically connected to each other via at least onebridge 203 located in a different layer from the touch electrode 20. Thenumber of the bridge 203 between adjacent sub-electrodes 202 in each ofthe touch electrodes 20 is not limited. In the embodiment, two bridges203 are arranged between adjacent sub-electrodes 202 in each of thetouch electrodes 20.

The touch display panel in the embodiment differs from the touch displaypanel in the above embodiment in that, as shown in FIG. 5, the commonelectrode layer 20 in the embodiment is located between the substrate 60and the pixel electrode 50, that is, the common electrode layer 20 inthe embodiment is located above a surface of the thin film transistor40, the pixel electrode 50 is located above a surface of the commonelectrode layer 20, and an insulating layer is located between the pixelelectrode 50 and the common electrode layer 20. In this case, the bridge203 may be located in the same layer with the gate 401 of the thin filmtransistor 40, or may be located in the same layer with the data line411, or may be located in a single layer. In the embodiment, preferably,the bridge 203 is located in the same layer with the gate 401, toincrease a distance between the touch lead 201 and the bridge 203,thereby reducing a parasitic capacitance between the touch lead 201 andthe bridge 203.

With the touch display panel according to the embodiment, the commonelectrode layer includes multiple touch electrodes insulated from eachother, and each of the touch electrodes is electrically connected to adriving circuit via one touch lead; the touch electrodes and the touchleads are located in the same layer; for a part of the touch electrodes,each touch electrode is divided into multiple sub-electrodes, where onetouch lead is located between any two adjacent sub-electrodes of thetouch electrode; and the sub-electrodes in each of the touch electrodesare electrically connected to each other via at least one bridge locatedin a different layer from the touch electrode. Hence, parasiticcapacitances between the touch leads and the touch electrodes arereduced and an influence from the parasitic capacitances on touchperformance is alleviated.

A touch display panel is provided according to a third embodiment of thepresent disclosure. The touch display panel in the embodiment differsfrom the touch display panel in the above embodiments in that, the touchdisplay panel in the embodiment further includes a common electrode wire205 electrically connected to the common electrode layer 20. The commonelectrode wire 205 is located in the same layer with the gate 401 of thethin film transistor 40 and is electrically connected to the commonelectrode layer 20 through a via hole 206, to reduce a resistance of thecommon electrode layer 20.

In view of the above, in the embodiment, the common electrode wire 205may function as the bridge to electrically connect the sub-electrodes202 in each of the touch electrodes. As shown in FIG. 6, the commonelectrode wire 205 is electrically connected to the sub-electrodes 202in one touch electrode through the via holes 206, and the commonelectrode wire 205 is disconnected in a marginal region of the touchelectrode, that is, the common electrode wire 205 between the touchelectrodes is disconnected. Alternatively, as shown in FIG. 7, thecommon electrode 205 may be connected to the sub-electrodes 202 in onetouch electrode in a form of the bridge.

With the touch display panel according to the embodiment, the commonelectrode layer includes multiple touch electrodes insulated from eachother, and each of the touch electrodes is electrically connected to adriving circuit via one touch lead; the touch electrodes and the touchleads are located in the same layer; for a part of the touch electrodes,each touch electrode is divided into multiple sub-electrodes, where onetouch lead is located between any two adjacent sub-electrodes of thetouch electrode; and the sub-electrodes in each of the touch electrodesare electrically connected to each other via at least one bridge locatedin a different layer from the touch electrode. Hence, parasiticcapacitances between the touch leads and the touch electrodes arereduced and an influence from the parasitic capacitances on touchperformance is alleviated.

A touch display panel is provided according to a fourth embodiment ofthe present disclosure. The touch display panel in the embodimentdiffers from the touch display panel in the above embodiments in that,the common electrode layer in the above embodiments is located on anarray substrate, while a common electrode layer in the embodiment islocated on a color film substrate, and a liquid crystal layer is furtherlocated between the color film substrate and the array substrate.

In the embodiment, the touch leads and the common electrode layer arelocated in the same layer. The bridges may be located in a single layerabove or below the common electrode layer, or may be located in the samelayer with any of other conducting layers on the color film substrate.Moreover, the bridge is electrically connected to the sub-electrodes inthe same touch electrode through the via holes. In the embodiment, thetouch leads and the common electrode layer are located in the samelayer, and the bridges and the common electrode layer are located indifferent layers, such that a distance between the touch lead and thebridge is increased, thereby reducing a parasitic capacitance betweenthe touch lead and the bridge.

With the touch display panel according to the embodiment, the commonelectrode layer includes multiple touch electrodes insulated from eachother, and each of the touch electrodes is electrically connected to adriving circuit via one touch lead; the touch electrodes and the touchleads are located in the same layer; for a part of the touch electrodes,each touch electrode is divided into multiple sub-electrodes, where onetouch lead is located between any two adjacent sub-electrodes of thetouch electrode; and the sub-electrodes in each of the touch electrodesare electrically connected to each other via at least one bridge locatedin a different layer from the touch electrode. Hence, parasiticcapacitances between the touch leads and the touch electrodes arereduced and an influence from the parasitic capacitances on touchperformance is alleviated.

A touch display device is provided according to a fifth embodiment ofthe present disclosure. The touch display device includes the touchdisplay panel according to any one of the above embodiments. A parasiticcapacitance between the touch lead and its adjacent touch electrode ofthe touch display panel is small, and accordingly, the touch performanceis good.

The embodiments of the specification are described in a progressivemanner, with the emphasis of each of the embodiments on the differencefrom the other embodiments; hence, for the same or similar parts betweenthe embodiments, one embodiment can be understood with reference to theother embodiments. The description of the embodiments herein enablesthose skilled in the art to implement or use the present disclosure.Numerous modifications to the embodiments are apparent to those skilledin the art, and the general principles defined herein can be implementedin other embodiments without deviating from the spirit or scope of thepresent disclosure. Therefore, the present disclosure may not be limitedto the embodiments described herein, but is in accordance with thewidest scope consistent with the principles and novel features disclosedherein.

What is claimed is:
 1. A touch display panel, comprising: a substrate,and a common electrode layer located on the substrate; wherein thecommon electrode layer comprises a plurality of touch electrodesinsulated from each other; each of the plurality of touch electrodes iselectrically connected to a driving circuit via one touch lead; thetouch electrodes and the touch leads are located in the same layer; apart of the plurality of touch electrodes are divided into a pluralityof sub-electrodes by touch leads adjacent to the divided touchelectrodes; and the sub-electrodes of each touch electrode areelectrically connected to each other via at least one bridge, the atleast one bridge being located in a different layer from the touchelectrode.
 2. The touch display panel of claim 1, further comprising aninsulating layer located between the substrate and the common electrodelayer, wherein the insulating layer comprises a plurality of via holes,and the at least one bridge is electrically connected to correspondingsub-electrodes through the via holes.
 3. The touch display panel ofclaim 2, wherein the touch display panel comprises a plurality of pixelunits, each of the plurality of pixel units comprises a thin filmtransistor, and the at least one bridge is located in the same layerwith a gate of the thin film transistor.
 4. The touch display panel ofclaim 2, further comprising a common electrode wire electricallyconnected to the touch electrodes, and the at least one bridge is formedby the common electrode wire.
 5. The touch display panel of claim 4,wherein the touch display panel comprises a plurality of pixel units,each of the plurality of pixel units comprises a thin film transistor,and the common electrode wire is located in the same layer with a gateof the thin film transistor.
 6. The touch display panel of claim 5,wherein the common electrode wire is electrically connected tocorresponding sub-electrodes through the via holes, and the commonelectrode wire is disconnected at a position between adjacent touchelectrodes.
 7. The touch display panel of claim 5, wherein the commonelectrode wire is connected to the sub-electrodes in a form of bridges.8. The touch display panel of claim 2, wherein the touch display panelcomprises a plurality of pixel units, each pixel unit comprises a thinfilm transistor, and the bridge is located in the same layer with asource or a drain of the thin film transistor.
 9. The touch displaypanel of claim 3, further comprising a pixel electrode located betweenthe substrate and the common electrode layer.
 10. The touch displaypanel of claim 6, further comprising a pixel electrode located betweenthe substrate and the common electrode layer.
 11. The touch displaypanel of claim 7, further comprising a pixel electrode located betweenthe substrate and the common electrode layer.
 12. The touch displaypanel of claim 3, further comprising a pixel electrode, wherein thecommon electrode layer is located between the substrate and the pixelelectrode.
 13. The touch display panel of claim 6, further comprising apixel electrode, wherein the common electrode layer is located betweenthe substrate and the pixel electrode.
 14. The touch display panel ofclaim 7, further comprising a pixel electrode, wherein the commonelectrode layer is located between the substrate and the pixelelectrode.
 15. A touch display device, comprising a touch display panel;wherein the touch display panel comprises a substrate, and a commonelectrode layer located on the substrate; wherein the common electrodelayer comprises a plurality of touch electrodes insulated from eachother; each of the plurality of touch electrodes is electricallyconnected to a driving circuit via one touch lead; the touch electrodesand the touch leads are located in the same layer; a part of theplurality of touch electrodes are divided into a plurality ofsub-electrodes by touch leads adjacent to the divided touch electrodes;and the sub-electrodes of each touch electrode are electricallyconnected to each other via at least one bridge, the at least one bridgebeing located in a different layer from the touch electrode.
 16. Thetouch display device of claim 15, wherein the touch display panelfurther comprises an insulating layer located between the substrate andthe common electrode layer, wherein the insulating layer comprises aplurality of via holes, and the at least one bridge is electricallyconnected to corresponding sub-electrodes through the plurality of viaholes.
 17. The touch display device of claim 16, wherein the touchdisplay panel comprises a plurality of pixel units, each of theplurality of pixel units comprises a thin film transistor, and the atleast one bridge is located in the same layer with a gate of the thinfilm transistor.
 18. The touch display device of claim 16, the touchdisplay panel further comprising a common electrode wire electricallyconnected to the touch electrodes, and the at least one bridge is formedby the common electrode wire.